[alsa-devel] [PATCH 3/3] ASoC: TWL6030: Handle power-up seq completion thru audio interrupt

[Mark Brown]

On Mon, Sep 14, 2009 at 12:00:42PM -0500, Lopez Cruz, Misael wrote:

> CODEC driver starts a wait_for_completion just after calling
> external power-up callback. It's signaled as complete when
> servicing READYINT interrupt.

When you convert to registering as a normal driver you should do this
waiting before registering the CODEC and DAI with the core - that will
stop the ASoC card coming up before the CODEC is ready and means that
you don't need to have a thread sitting blocked on the startup
completing.

> MACHINE drivers should request IRQ line used in corresponding
> hardware platform and initialize workqueue and completion structs
> of twl6030_setup_data as well.

I worry what will happen when someone builds a machine which doesn't
bother hooking up the interrupt line - is it possible to poll for
completion of startup if no interrupt is provided?  If they aren't using
the jack and accessory detect functionality I can see someone not
bothering to hook it up.  OTOH that could always be added later on if
required.